-LRB- CNN -RRB- Police have arrested four students from Wesleyan University in connection with a drug overdose over the weekend . They are to appear in court next week .

Ten students and two visitors were hospitalized Sunday from complications arising from the use of the drug Molly or from alcohol .

The Middletown , Connecticut , Police Department reported that 11 were hospitalized because of Molly and one because of alcohol .

The arrested students were Andrew Olson , 20 ; Rama Agha Al Kakib , 20 ; Eric Lonergan , 21 , and Zachary Kramer , 21 , police said in a statement . They face charges ranging from possession of a controlled substance and possession of a hallucinogen to possession of drug paraphernalia .

Lonergan faces 16 counts of illegally obtaining or supplying drugs .

Wesleyan University has suspended the students .

University President Michael S. Roth has described Molly as a refined form of MDMA with `` extremely dangerous '' effects . MDMA is the active ingredient in the drug ecstasy .

According to the Drug Enforcement Administration , most often Molly is not MDMA , but a toxic mixture of lab-created chemicals .

And Middletown police said on Tuesday that they expect multiple designer drugs were in the Molly . They have executed four search warrants to find out more about where the drugs came from .

Most of the chemicals are meant to stimulate the central nervous system to cause euphoric highs .

They can also cause a rapid heartbeat , high blood pressure , blood vessel constriction and sweating , and can prevent the body from regulating temperature . Some of the chemicals have been reported to cause intense , prolonged panic attacks , psychosis and seizures .

9 things everyone should know about the drug Molly

Roth told all students to stay away from all drugs . `` One mistake can change your life forever , '' he said .

CNN 's Jean Casarez , Drew Griffin , Nelli Black and Patricia DiCarlo contributed to this report .

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The batch of Molly might have had a mix of different designer drugs , police say

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Molly is a synthetic drug with dangerous effects